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To calculate the % of ash content the dry coal is heated in ____________

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To calculate the % of ash content the dry coal is heated in ____________

(a) blast furnace

(b) muffle furnace

(c) reverberatory furnace

(d) electric furnace

The question was posed to me at a job interview.

I need to ask this question from Analysis of Coal and Selection topic in chapter Fuel Technologies of Applied Chemistry

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The correct answer is (b) muffle furnace

Best explanation: The ash content is found by heating the moisture less coal in muffle furnace. Reverberatory furnace is a metallurgical or process furnace.

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